Web Accessibility Inspector examines the accessibility of a website and points out any important problem that affects mainly the elderly and visually disabled people.

Section 508 Web Accessibility Checker Find out if your website is following section 508 standard or not. Section 508 is a US Law with the purpose to provide access to and use of Federal executive agencies’ electronic and information technology (EIT) by individuals with disabilities.

IBM aDesigner A disability simulator that helps Web designers ensure that their pages are accessible and usable by the visually impaired.

ColorDoctor is software for Windows that simulates the display content according to grayscale and color characteristics.

WebAIM Wave is a great visual tool for improving accessibility! Instead of generating reports on errors it shows you the error spots on your webpage.